... 2.Hardness:HRC58-61 3.High precision,ABEC-1,P0 3/16 inch ,4.763mm ball bearing steel balls,used for ... bearings ABEC-1,P0 high precision ,good quality ,fast ... bearing steel ball1)material:AISI52100 GCr152)Size:1/8",1/4",3/16",5/16",5/32",3/8"3)Grade:G10-G10004 ... ≤0.0251.35-1.65100CrMn60.90-1.050.5-0.71.00-1.20≤0.03≤0.0251.35-1.65Packing We packed ...